Abstract
Artificial magnetic conductor structures (AMCs) is an effective approach to significantly improve the bandwidth and radiation gain of low-profile antennas. Comparing with other techniques, it needs no extra fabricated processes and takes the merit of easy integration. Three examples of AMC structure-based patch antennas are proposed and experimentally demonstrated. As a result, the 2×2 edge-fed patch antenna array using AMCs can achieve over 4 times bandwidth enhancement and about 3dB peak gain improvement than cavity backed antenna. Comparing with the conventional square AMCs, the patch antenna using the AMCs with inserted-stubs can achieve wider bandwidth and higher and more stable gain. Although low temperature co-fired ceramics (LTCC) substrate has a high permittivity, the relative bandwidth of the mmW LTCC antenna array using AMCs can reach 13.7%, which is about 5 times wider than that of ordinary antenna; meanwhile the peak gain can reach 13.3dBi, the stable gain (±1dB) and radiation pattern in the whole band of interest can be observed also.
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